stree.txt

词法分析

 0:program
   1:declaration_list
     2:declaration
       3:reserved word: int
       3:ID, name= main
       3:declaration_  
         4:fun_declaration
           5:(
           5:params
             6:reserved word: void
           5:)
           5:compound_stmt
             6:{
             6:local_declarations
               7:reserved word: int
               7:ID, name= a
               7:var_declaration
               7:local_declarations
             6:statement_list
             6:}
     2:declaration_list_